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Finding the Fourth Proportional to 1,213.72, 1,674.79 and 682.63

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Solution

The fourth proportional to 1,213.72, 1,674.79 and 682.63 is: 941.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.72 : 1,674.79 = 682.63 : x
  2. Step 2: Convert to fraction form
    1,213.72/1,674.79 = 682.63/x
  3. Step 3: Cross multiply
    1,213.72x = 1,674.79 × 682.63
  4. Step 4: Simplify right side
    1,213.72x = 1,143,261.90
  5. Step 5: Solve for x
    x = 1,143,261.90/1,213.72
  6. Step 6: Final answer
    x = 941.95

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.